avcodec/mediacodecenc: workaround the alignment requirement for H.265

Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>

libavcodec/mediacodecenc.c

@@ -201,9 +201,18 @@ static av_cold int mediacodec_init(AVCodecContext *avctx)
     // Workaround the alignment requirement of mediacodec. We can't do it
     // silently for AV_PIX_FMT_MEDIACODEC.
     if (avctx->pix_fmt != AV_PIX_FMT_MEDIACODEC &&
-        avctx->codec_id == AV_CODEC_ID_H264) {
+        (avctx->codec_id == AV_CODEC_ID_H264 ||
+         avctx->codec_id == AV_CODEC_ID_HEVC)) {
         s->width = FFALIGN(avctx->width, 16);
         s->height = FFALIGN(avctx->height, 16);
+        // If avctx video size is aligned to 16 already, we don't need to do
+        // anything. If align is needed for HEVC, we should use the maximum CTU
+        // size.
+        if (avctx->codec_id == AV_CODEC_ID_HEVC &&
+            (s->width != avctx->width || s->height != avctx->height)) {
+            s->width = FFALIGN(avctx->width, 64);
+            s->height = FFALIGN(avctx->height, 64);
+        }
     } else {
         s->width = avctx->width;
         s->height = avctx->height;